756 SOLANACEAE 



close-fitting to the berry. Corolla rotate, white or ochroleucous, often tinged 

 \vith purple, plicate. Stamens 5; filaments adnate to the base of the corolla; 

 anther opening by longitudinal slits. Seeds reniform, flattened, rugose-favose. 



Pubescence dense, hirsute as well as puberulent. 1. C. conioides. 



Pubescence sparse, puberulent or stellate, hirsute if at all only on the calj-x. 



2. C. Coronopus. 



1. C. conioides (Moric.) Britton. Stems erect, decumbent, or prostrate, 

 viscid; leaf-blades oblanceolate to obovate-rhombic, acute and tapering into 

 short petioles, usually deeply lobed, varying from subentire to pinnatifid; calyx- 

 lobes triangular, acutish; corolla about 1 cm. broad, white or ochroleucous. C. 

 sordida (Dunal) A. Gray. Dry clayey soil: Kans. Colo. Ariz. Tex.; Mex. 

 Son. My-Jl. 



2. C. Coronopus (Dunal) A. Gray. Stem obtusely angled; leaf-blades 

 linear or lanceolate, sinuately lobed to pinnatifid, pruinose; calyx-lobes triangular, 

 acute; corolla white or ochroleucous. Dry clayey soil: Kans. Colo. Ariz. 

 Tex. Son. Submont. My-D. 



4. ANDROSERA Nutt. BUFFALO BUR. 



Annual prickly herbs. Leaves alternate, pinnatifid. Flowers perfect, 

 cymose. Calyx campanulate, prickly, somewhat accrescent and enclosing the 

 berry in fruit, 5-lobed. Corolla yellow or purple, 5-lobed, plaited. Stamens 5, 

 dissimilar, declined, adnate to near the throat of the corolla; anthers narrow, 

 opening by terminal pores. Ovary 2-celled. Fruit a berry, enclosed in the 

 prickly calyx. Seeds flattened. 



1. A. rostrata (Dunal) Rydb. Stem yellowish-hirsute and prickly, 2-7 

 dm. high, widely branching; leaf-blades 5-12 cm. long, once or twice pinnatifid; 

 segments oval to oblong, obtuse, entire or undulate, yellowish hirsute; calyx 

 bristly; corolla yellow, about 2.5 cm. broad. Solanum rostratum Dunal. Waste 

 places, prairies, and river valleys: N.D. Tex. N.M. Wyo.; Mex.; adv. east- 

 ward to N.H. and Fla. Plain Submont. Mr-S. 



6. SOLANUM (Tourn.) L. NIGHTSHADE, BITTERSWEET, POTATO, 



HORSE NETTLE. 



Annual or perennial, often prickly, or most of ours unarmed herbs, rarely 

 vines. Leaves alternate, entire, toothed or pinnatifid. Flowers perfect, regular, 

 in cymes, racemes, umbels, or panicles. Calyx from campanulate to rotate; 

 lobes 5. Corolla variously colored, rotate, 5-angled or 5-lobed, plicate. Stamens 

 5, adnate to near the throat of the corolla. Anthers narrow, converging or 

 united into a cone; sacs opening by terminal pores, rarely lengthwise. Ovary 

 mostly 2-celled. Fruit a berry, seated in the calyx. Seeds flattened. 



Annuals. 



Leaves pinnatifid. 1. S. triflorum. 



Leaves sinuately dentate or entire. 



Plant strigose or glabrous; berry black. 



Leaves glabrous or nearly so; sepals very obtuse. 2. S. nigrum. 



Leaves decidedly strigose beneath; sepals abruptly acutish. 



Corolla-lobes 3-4 mm. long. 3. S. interius. 



Corolla-lobes 6-8 mm. long. 4. S. Douglasii. 



Plant more or less viscid- villous ; berry greenish or yellowish. 5. S. villosum. 

 Perennials. 



Plant green, glabrous or pubescent, but not stellate, never prickly. 



Low plants with tuber-bearing rootstocks; leaves pinnately divided into 57 divi- 

 sions. 6. S. Jamesii. 

 Tall plants,- more or less woody below, not tuberiferous ; leaves simple or pinnately 



3-lobed. 



Plant climbing; berry ellipsoid. 7. S. Dulcamara. 



Plant not climbing; berry giobose. 4. S. Douglasii. 



Plant with stellate hairs; stem often prickly. 



Leaves silvery-white, oblong to linear. 8. S. elaeagni folium. 



Leaves green, ovate, sinuately toothed. 9. 5. carolinense. 



1. S. triflorum Nutt. Stem branched at the base, spreading, 2-9 dm. 

 long, sparingly hirsute; leaf -blades oblong or ovate in outline, pinnatifid, 3-9 cm. 

 long; lobes acute, entire or toothed; calyx-lobes oblong or oblong-lanceolate; 



